*: developer machine HSPKI credentials

In addition to k8s certificates, prodaccess now issues HSPKI
certificates, with DN=$username.sso.hswaw.net. These are installed into
XDG_CONFIG_HOME (or os equiv).

//go/pki will now automatically attempt to load these certificates. This
means you can now run any pki-dependant tool with -hspki_disable, and
with automatic mTLS!

Change-Id: I5b28e193e7c968d621bab0d42aabd6f0510fed6d
diff --git a/cluster/prodaccess/prodaccess.go b/cluster/prodaccess/prodaccess.go
index e0e8ec2..1153bab 100644
--- a/cluster/prodaccess/prodaccess.go
+++ b/cluster/prodaccess/prodaccess.go
@@ -99,6 +99,9 @@
 	}
 
 	useKubernetesKeys(res.KubernetesKeys)
+	fmt.Printf("-> Kubernetes credentials installed\n")
+	useHSPKIKeys(res.HspkiKeys)
+	fmt.Printf("-> HSPKI credentials installed\n")
 
 	return true
 }